From: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Sat, 21 Oct 2023 17:06:38 +0000 (+0200)
Subject: conn: fix cmsg data padding calculation for gso
X-Git-Tag: 0.0.20250515~22
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f502ec3fad116d11109529bcf283e464f4822c18;p=thirdparty%2Fwireguard-go.git

conn: fix cmsg data padding calculation for gso

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---

diff --git a/conn/gso_linux.go b/conn/gso_linux.go
index b8599ce..8596b29 100644
--- a/conn/gso_linux.go
+++ b/conn/gso_linux.go
@@ -56,7 +56,7 @@ func setGSOSize(control *[]byte, gsoSize uint16) {
 	hdr.Level = unix.SOL_UDP
 	hdr.Type = unix.UDP_SEGMENT
 	hdr.SetLen(unix.CmsgLen(sizeOfGSOData))
-	copy((gsoControl)[unix.SizeofCmsghdr:], unsafe.Slice((*byte)(unsafe.Pointer(&gsoSize)), sizeOfGSOData))
+	copy((gsoControl)[unix.CmsgLen(0):], unsafe.Slice((*byte)(unsafe.Pointer(&gsoSize)), sizeOfGSOData))
 	*control = (*control)[:existingLen+space]
 }